Underground Service Alert Color Markings

Underground Service Alert

APWA Utility Color Code

RED = Electric

YELLOW = Gas-Oil-Steam

ORANGE = Communication and Cable TV

BLUE = Water

GREEN = Sewer

PURPLE = Reclaimed Water

WHITE = Proposed Excavation

Depths are unpredictable - there’s no general rule. Utilities are not usually placed at specific depths.

--------------------------------------------------------------------------------
Common Marking Identifiers

E=Electric
G=Gas
S=Sewer
SD=Storm Drain
SL=Street Lighting
TEL=Telephone
TS=Traffic Signal
TV=Television
W=Water/Reclaimed Water
USA=Underground Service Alert

--------------------------------------------------------------------------------
Common abbreviations and descriptions as used in underground construction.

ABS=Acrylonitrile-butadiene-styrene
ACP=Asbestos cement pipe
CAP=Corrugated aluminum pipe
CIP=Cast iron pipe
CMC=Cement mortar coated
CML=Cement mortar lined
CSP=Corrugated steel pipe
CU=Cooper
DIP=Ductile iron pipe
DU=Duct
ELC=Electrolier lighting conduit
FC=Fiber conduit
GIP=Galvanized iron pipe
GSP=Galvanized steel pipe
IP=Iron pipe
MCD=Multiple concrete duct
MH=Manhole
MTD=Multiple tile duct
P=Plastic(conduit or pipe)
PB=Pull box
PC=Plastic conduit
PE=Polyethylene
PL=Property line
PVC=Polyvinyl chloride
R=Radius
RCB=Reinforced concrete box
RCP=Reinforced concrete pipe
SCCP=Steel cylinder concrete pipe
STL=Steel
STRUC=Structure
T=Transmission facility
TR=Transite(asbestos cement pipe)
Trans=Transition
TSC=Traffic signal conduit
VCP=Vertrified clay pipe

Traffic Signal Wiring

New traffic signal (in SLO) head wiring colors:
Green: Brown
Yellow: Yellow
Red: Red
Neutral: White

Walk: Brown
Don’tWalk: Red
Neutral: White

Terminal strip in Pole J-Box: 12 position 2 screw terminals per position